Quicklime digestion steam recovery treatment system based on three-stage purification

Abstract

The utility model relates to the field of ferrous metallurgy, and discloses a quick lime digestion steam recovery processing system based on three-stage purification, which comprises a digester, a water outlet end of the digester is fixedly connected with a pipeline water curtain dust remover, and a smoke outlet end of the pipeline water curtain dust remover is fixedly connected with a spray tower. The waste water end of the pipeline water curtain dust removal is fixedly connected to the water inlet end of the digester, the smoke outlet end of the spray tower is fixedly connected with a wet electric dust removal device, the smoke outlet end of the wet electric dust removal device is fixedly connected with a dust removal fan, the smoke outlet end of the dust removal fan is fixedly connected with a chimney, and the feeding end of the pipeline water curtain dust removal device is provided with a conveying assembly. According to the utility model, the digester, the belt conveyor, the pipeline water curtain dust remover, the spray tower, the wet electric dust remover, the dust removal fan and the chimney are matched with one another, so that quick lime and water are digested in the digester to generate water vapor, the water vapor is discharged into the atmosphere through three-stage purification, and the problem of recycling the water vapor containing calcium oxide and calcium hydroxide is solved.

Description

Technical Field

[0001] The utility model relates to the field of iron and steel metallurgy, in particular to a quicklime digestion vapor recovery and treatment system based on three-stage purification. Background Art

[0002] In the sintering mixing process, quicklime is digested to generate calcium hydroxide, which is an important component of the solvent in the sintering raw materials. Due to its adhesiveness, extremely fine particle size and exothermic reaction during the digestion process, it can play a good bonding role, improve the air permeability of the sintering material layer, and reduce fuel consumption. Therefore, quicklime digestion is an indispensable process before sintering mixing. However, the large amount of water vapor containing calcium oxide and calcium hydroxide generated during the quicklime digestion process not only greatly pollutes the surrounding environment, but also causes the surrounding calcification to adhere, the land to alkaline agglomeration and deterioration, and trees cannot grow.

[0003] The digestion process of quicklime in the digester is an exothermic chemical reaction, which produces a large amount of water vapor. Calcium oxide breaks during the reaction, and calcium oxide and calcium hydroxide powder overflow with water vapor. If it is not collected by a verified method, it will cause great pollution to the surrounding environment and endanger the occupational health of operators in the batching position. Therefore, there are the following problems: 1. The problem of recovering water vapor containing calcium oxide and calcium hydroxide; 2. The problem of wastewater treatment during the purification process; 3. Due to the characteristics of wet smoke dust of lime itself, it is very easy to block the dust collection pipeline during actual use. Therefore, a quicklime digestion vapor recovery and treatment system based on three-stage purification is proposed to solve the above problems. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a quicklime digestion vapor recovery and treatment system based on three-stage purification, which aims to improve the problems of water vapor recovery containing calcium oxide and calcium hydroxide in the prior art, the wastewater treatment problem during the purification process, and the problem that the dust collection pipeline is very easy to be blocked during actual use due to the characteristics of the wet smoke dust of the lime itself.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a quicklime digestion vapor recovery and treatment system based on three-stage purification, comprising a digester, wherein the water outlet end of the digester is fixedly connected with a pipeline water curtain dust collector, the smoke outlet end of the pipeline water curtain dust collector is fixedly connected with a spray tower, the wastewater end of the pipeline water curtain dust collector is fixedly connected with the water inlet end of the digester, the smoke outlet end of the spray tower is fixedly connected with a wet electrostatic precipitator, the smoke outlet end of the wet electrostatic precipitator is fixedly connected with a dust removal fan, the smoke outlet end of the dust removal fan is fixedly connected with a chimney, the feeding end of the pipeline water curtain dust collector is provided with a conveying component, the water inlet end of the spray tower is provided with a water delivery component, the wastewater end of the wet electrostatic precipitator is provided with a circulation component, and the water inlet of the wet electrostatic precipitator is provided with a flushing component.

[0006] As a further description of the above technical solution:

[0007] The conveying assembly comprises a belt conveyor, and the conveying end of the belt conveyor is fixedly connected to the feeding end of the pipeline water curtain dust removal.

[0008] As a further description of the above technical solution:

[0009] The water delivery component comprises a pump group 1, an output end of the pump group 1 is fixedly connected to the water inlet end of the spray tower, and a pumping end of the pump group 1 is fixedly connected to a circulating water pool.

[0010] As a further description of the above technical solution:

[0011] The circulation component comprises a sedimentation tank, a water inlet end of the sedimentation tank is fixedly connected to the wastewater end of the wet electrostatic precipitator, and a stirrer is fixedly connected to the bottom of the sedimentation tank.

[0012] As a further description of the above technical solution:

[0013] The flushing component includes a second pump group, the output end of the second pump group is fixedly connected to the water inlet of the wet electrostatic precipitator, and the water suction end of the second pump group is fixedly connected to a water tank.

[0014] As a further description of the above technical solution:

[0015] A dust removal pipeline is arranged at the connection between the pipeline water curtain dust removal and the spray tower, one of the water outlet ends of the circulating water pool is fixedly connected to a pump group four, and the output end of the pump group four is fixedly connected to the dust removal pipeline.

[0016] As a further description of the above technical solution:

[0017] The upper water outlet end of the sedimentation tank is fixedly connected to the water inlet end of the circulating water tank, the lower water outlet end of the sedimentation tank is fixedly connected to a water pump three, and the output end of the water pump three is fixedly connected to a mixer.

[0018] As a further description of the above technical solution:

[0019] The circulating water pool and the water supply end of the water tank are both provided with clean loop water supply.

[0020] The utility model has the following beneficial effects:

[0021] 1. In the utility model, through the cooperation among the digester, belt conveyor, pipeline water curtain dust removal, spray tower, wet electrostatic precipitator, dust removal fan and chimney, quicklime and water are digested in the digester to generate water vapor which is discharged into the atmosphere after three-stage purification, thus solving the problem of water vapor recovery containing calcium oxide and calcium hydroxide.

[0022] 2. In the utility model, through the mutual cooperation among pump group 1, circulating water tank, sedimentation tank, water tank, pump group 2, water pump 3, pump group 4 and mixer, the purified wastewater is returned to the sedimentation tank from the spray tower and the bottom pipeline of the wet electrostatic precipitator, which solves the problem of wastewater treatment in the purification process. In view of the problem of blockage of lime smoke pipeline, the dust removal pipeline is set at a certain inclination angle, and a separate pump group 4 is set to introduce a water channel to flush the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a principle display diagram of a quicklime digestion vapor recovery and treatment system based on three-stage purification proposed by the utility model.

[0024] Legend:

[0025] 1. Digester; 2. Belt conveyor; 3. Pipe water curtain dust removal; 4. Spray tower; 5. Wet electrostatic precipitator; 6. Dust removal fan; 7. Chimney; 8. Pump group one; 9. Circulating water pool; 10. Sedimentation tank; 11. Water tank; 12. Pump group two; 13. Water pump three; 14. Pump group four; 15. Mixer. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Reference Figure 1The utility model provides an embodiment: a quicklime digestion vapor recovery and treatment system based on three-stage purification, comprising a digester 1, a water outlet end of the digester 1 is fixedly connected with a pipeline water curtain dust collector 3, a smoke outlet end of the pipeline water curtain dust collector 3 is fixedly connected with a spray tower 4, a wastewater end of the pipeline water curtain dust collector 3 is fixedly connected to a water inlet end of the digester 1, a wet electrostatic precipitator 5 is fixedly connected to the smoke outlet end of the spray tower 4, a dust removal fan 6 is fixedly connected to the smoke outlet end of the wet electrostatic precipitator 5, a chimney 7 is fixedly connected to the dust removal fan 6 at the smoke outlet end, a conveying component is arranged at the feeding end of the pipeline water curtain dust collector 3, a water supply component is arranged at the water inlet end of the spray tower 4, a circulation component is arranged at the wastewater end of the wet electrostatic precipitator 5, and a dust removal fan 6 is fixedly connected to the smoke outlet end of the wet electrostatic precipitator 5. A flushing component is provided at the water inlet of the dust collector 5, the conveying component includes a belt conveyor 2, the conveying end of the belt conveyor 2 is fixedly connected to the feeding end of the pipeline water curtain dust collector 3, the water delivery component includes a pump group 8, the output end of the pump group 8 is fixedly connected to the water inlet end of the spray tower 4, and the pumping end of the pump group 8 is fixedly connected to a circulating water pool 9, the flushing component includes a pump group 2 12, the output end of the pump group 2 12 is fixedly connected to the water inlet of the wet electrostatic precipitator 5, and the water suction end of the pump group 2 12 is fixedly connected to a water tank 11, a dust removal pipeline is provided at the connection between the pipeline water curtain dust collector 3 and the spray tower 4, one of the water outlet ends of the circulating water pool 9 is fixedly connected to a pump group 4 14, and the output end of the pump group 4 14 is fixedly connected in the dust removal pipeline.

[0028] Specifically, a pipeline water curtain dust removal 3 is set in the vertical pipe section above the digester 1 as the first stage of purification. The water curtain dust removal stage is three to four, and the weight ratio of water to quicklime is 5:9. The wastewater of the pipeline water curtain dust removal 3 flows back to the digester 1 through the vertical pipe as the main water supply for the digestion reaction. A dust removal pipeline is set at the connection between the pipeline water curtain dust removal 3 and the spray tower 4. The inclination angle of the dust removal pipeline is greater than 15°. Flushing water is set at the upper end of each straight pipe and main pipe, and water is supplied separately by pump group four 14. The water volume of a single flushing port is 3m³-5m³, and the pressure is 0.25-0.4MPa. After one purification, the smoke dust enters the spray tower 4 from bottom to top through the dust removal pipeline. The spray tower 4 is supplied with water by pump group one 8 with a water volume of 60-75m³ / h and a pressure of 0.4-0.6MPa. The water source is taken from the circulating water pool 9 and is passed through the two After the first purification, the flue gas enters the wet electrostatic precipitator 5 and is treated three times by the electrostatic precipitator high-voltage battery. The secondary voltage is set to 65KV. The electrostatic precipitator is provided with flushing water. The electric field is stopped every 8 hours to flush the electrostatic precipitator. Each flushing time is 10-20 minutes. The flushing water is supplied separately by the pump group 2 12. The water source is taken from the water tank 11. The flushing water pressure is 0.8-0.12MPa, and the water volume is 30m³ / h. After the three purifications of the wet electrostatic precipitator 5, the flue gas is discharged into the atmosphere through the dust collection fan 6 and the chimney 7. The dust collection fan 6 provides suction for the collection of digestion water vapor. The air volume of the dust collecting port just above the digester 1 is 15000-20000m³ / h, and the air volume of the slaked lime belt conveyor is 8000-10000m³ / h. According to the actual situation, a dust collecting port is set every 8-12m of the belt conveyor 2.

[0029] Reference Figure 1The circulation component includes a sedimentation tank 10, the water inlet end of the sedimentation tank 10 is fixedly connected to the wastewater end of the wet electrostatic precipitator 5, the bottom of the sedimentation tank 10 is fixedly connected to a mixer, the upper water outlet end of the sedimentation tank 10 is fixedly connected to the water inlet end of the circulating water tank 9, the lower water outlet end of the sedimentation tank 10 is fixedly connected to a water pump 3 13, the output end of the water pump 3 13 is fixedly connected to a mixer 15, and the water replenishment ends of the circulating water tank 9 and the water tank 11 are both provided with clean ring water replenishment.

[0030] Specifically, after spraying by the spray tower 4, the waste water flows back to the sedimentation tank 10 from the bottom pipe of the spray tower 4. After flushing the wet electrostatic precipitator 5, the waste water flows to the bottom of the precipitator by gravity and flows back to the sedimentation tank 10 through the pipe. An agitator is arranged at the bottom of the sedimentation tank 10, and the agitator speed is 8r / min. A water pump 3 13 is arranged to introduce the sewage from the sedimentation tank 10 into the mixer 15 as mixing water. The water suction port of the water pump 3 13 is located at 0.4m from the bottom of the water tank. The sedimentation tank 10 is connected to the circulating water tank 9, and an overflow port is arranged at the top. The excess overflow in the sedimentation tank 10 is transferred to the circulating water tank 9 to participate in the water circulation.

[0031] Working principle: quicklime and water are digested in the digester 1 to produce water vapor, which is sucked by the dust removal fan 6 with negative pressure, and then discharged into the atmosphere through the first-stage pipeline water curtain dust removal 3, the second-stage spray tower 4 for secondary spray purification, and the third-stage flue gas wet electrostatic precipitator 5. The purified flue gas is discharged into the atmosphere. The first purification water curtain wastewater flows back to the digester 1 along the pipeline as water for digestion reaction. The wastewater after the second and third purifications flows back to the sedimentation tank 10 from the bottom pipeline of the spray tower 4 and the wet electrostatic precipitator 5. Considering the problem of blockage of lime smoke pipeline, the dust removal pipeline is set at a certain inclination angle, and a separate pump group 4 14 is set to introduce a water channel to flush the pipeline. An overflow port is set between the sedimentation tank 10 and the circulating water tank 9. After the upper water overflows, it enters the circulating water tank 9 for spraying again. A mixer is set at the bottom of the sedimentation tank 10, and the high-concentration wastewater is introduced into the mixer 15 for use by the water pump 3 13.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A quicklime digestion vapor recovery and treatment system based on three-stage purification, comprising a digester (1), characterized in that: The water outlet end of the digester (1) is fixedly connected to a pipeline water curtain dust collector (3), the smoke outlet end of the pipeline water curtain dust collector (3) is fixedly connected to a spray tower (4), the wastewater end of the pipeline water curtain dust collector (3) is fixedly connected to the water inlet end of the digester (1), the smoke outlet end of the spray tower (4) is fixedly connected to a wet electrostatic precipitator (5), the smoke outlet end of the wet electrostatic precipitator (5) is fixedly connected to a dust removal fan (6), the smoke outlet end of the dust removal fan (6) is fixedly connected to a chimney (7), the feed end of the pipeline water curtain dust collector (3) is provided with a conveying component, the water inlet end of the spray tower (4) is provided with a water delivery component, the wastewater end of the wet electrostatic precipitator (5) is provided with a circulation component, and the water inlet of the wet electrostatic precipitator (5) is provided with a flushing component.

2. A quicklime digestion vapor recovery and treatment system based on three-stage purification according to claim 1, characterized in that: The conveying assembly comprises a belt conveyor (2), the conveying end of the belt conveyor (2) being fixedly connected to the feeding end of the pipeline water curtain dust removal (3).

3. A quicklime digestion vapor recovery and treatment system based on three-stage purification according to claim 1, characterized in that: The water delivery assembly comprises a pump group 1 (8), the output end of the pump group 1 (8) being fixedly connected to the water inlet end of the spray tower (4), and the water pumping end of the pump group 1 (8) being fixedly connected to a circulating water pool (9).

4. A quicklime digestion vapor recovery and treatment system based on three-stage purification according to claim 3, characterized in that: The circulation component comprises a sedimentation tank (10), the water inlet end of the sedimentation tank (10) is fixedly connected to the wastewater end of the wet electrostatic precipitator (5), and the bottom of the sedimentation tank (10) is fixedly connected to a stirrer.

5. A quicklime digestion vapor recovery and treatment system based on three-stage purification according to claim 4, characterized in that: The flushing assembly comprises a second pump group (12), the output end of the second pump group (12) being fixedly connected to the water inlet of the wet electrostatic precipitator (5), and the water suction end of the second pump group (12) being fixedly connected to a water tank (11).

6. A quicklime digestion vapor recovery and treatment system based on three-stage purification according to claim 3, characterized in that: A dust removal pipeline is provided at the connection between the pipeline water curtain dust removal (3) and the spray tower (4); one of the water outlet ends of the circulating water pool (9) is fixedly connected to a pump group four (14); and the output end of the pump group four (14) is fixedly connected to the dust removal pipeline.

7. A quicklime digestion vapor recovery and treatment system based on three-stage purification according to claim 4, characterized in that: The upper water outlet end of the sedimentation tank (10) is fixedly connected to the water inlet end of the circulating water tank (9), the lower water outlet end of the sedimentation tank (10) is fixedly connected to a water pump three (13), and the output end of the water pump three (13) is fixedly connected to a mixer (15).

8. The quicklime digestion vapor recovery and treatment system based on three-stage purification according to claim 5 is characterized in that: The water supply ends of the circulating water pool (9) and the water tank (11) are both provided with clean loop water supply.

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